Dry vacuum device of double-screw extruder

Abstract

The utility model relates to a dry type vacuum device of a double-screw extruder, which comprises a pump body and a driving motor arranged on the pump body, a pump cavity is arranged in the pump body, an end cover is arranged on the pump body, a claw knife group is arranged in the pump cavity, and an exhaust port and an air inlet are arranged on the pump body. The one-way cleaning assembly is arranged in the exhaust port, and during exhaust, the inner wall of the exhaust port is cleaned through the one-way cleaning assembly; according to the dry type vacuum device of the double-screw extruder, when gas is exhausted from the exhaust port, the piston plate is pushed to overcome the elastic force of the spring to move upwards, and stable sliding is achieved under the action of the sliding rod and the mounting frame. The edge of the piston plate clings to the inner wall of the exhaust port and is positioned above the exhaust groove, so that the inner wall of the exhaust port can be cleaned when the piston plate moves downwards, and the exhaust efficiency is effectively prevented from being influenced by long-term adsorption of oligomers.

Description

Technical Field

[0001] This utility model belongs to the field of plastic production technology, specifically relating to a dry vacuum device for a twin-screw extruder. Background Technology

[0002] A twin-screw extruder dry vacuum unit is a device that uses two parallel rotating screws to heat and melt materials, which are then extruded through a die to form the final product. During the extrusion process, the accompanying vacuum system effectively removes gases and moisture from the material, thereby improving product quality and stability. Claw vacuum pumps are commonly used dry vacuum devices in twin-screw extruder applications.

[0003] Traditional claw vacuum pumps tend to adsorb oligomers at the exhaust port during exhaust. Over time, these oligomers can severely affect the exhaust efficiency of the exhaust port, thereby reducing the overall performance of the vacuum device. To address this, a dry vacuum device using a twin-screw extruder is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a self-cleaning dry vacuum device for twin-screw extruders in order to solve the above-mentioned problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A dry vacuum device for a twin-screw extruder includes a pump body and a drive motor mounted on the pump body. The pump body has a pump chamber, the pump body has an end cover, the pump chamber has a claw knife assembly, and the pump body has an exhaust port and an air inlet.

[0007] It also includes:

[0008] A one-way cleaning component is installed inside the exhaust port. During exhaust, the one-way cleaning component cleans the inner wall of the exhaust port.

[0009] An exhaust channel is provided on the inner wall of the exhaust port, through which exhaust is carried out.

[0010] As a further optimization of this utility model, the one-way cleaning component includes a mounting bracket, which is disposed inside the exhaust port. A slide rod is slidably disposed on the mounting bracket, and a piston plate is disposed at the lower end of the slide rod. A spring is disposed between the piston plate and the mounting bracket, and a limiting ring is disposed inside the exhaust port, which is disposed above the piston plate.

[0011] As a further optimization of this utility model, the edge of the piston plate is in close contact with the inner wall of the exhaust port, and the piston plate is disposed above the exhaust groove.

[0012] As a further optimization of this utility model, there are multiple exhaust grooves, which are evenly distributed on the inner wall of the exhaust port.

[0013] As a further optimization of this utility model, the claw knife assembly includes multiple first claw knives and multiple second claw knives. The multiple first claw knives are coaxially arranged in the pump cavity, and the multiple second claw knives are coaxially arranged in the pump cavity. A drive gear is provided on the mounting shaft of the first claw knife, and a driven gear is provided on the mounting shaft of the second claw knife. The drive gear and the driven gear mesh with each other. The mounting shaft of the first claw knife is connected to the output end of the drive motor.

[0014] As a further optimization of this utility model, a placement rack is provided at the lower end of the exhaust port, and a temperature sensor is provided on the placement rack.

[0015] The beneficial effects of this utility model are as follows:

[0016] Unlike existing technologies, in actual use, when gas is discharged from the exhaust port, it pushes the piston plate upward against the spring force, achieving stable sliding under the action of the slide rod and mounting bracket. Because the edge of the piston plate is in close contact with the inner wall of the exhaust port and is located above the exhaust groove, its downward movement can clean the inner wall of the exhaust port, effectively preventing long-term adsorption of oligomers and thus avoiding affecting exhaust efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the disassembled pump body structure of this utility model;

[0019] Figure 3 This is a partial cross-sectional structural diagram of the exhaust port of this utility model;

[0020] Figure 4 This is a schematic diagram of the claw blade assembly structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0022] In the diagram: 1. Pump body; 11. Pump chamber; 12. End cover; 2. Drive motor; 3. Air inlet; 4. Exhaust port; 5. Claw knife assembly; 51. First claw knife; 511. Drive gear; 52. Second claw knife; 521. Driven gear; 6. One-way cleaning assembly; 61. Piston plate; 62. Restriction ring; 63. Spring; 64. Mounting bracket; 65. Slide rod; 7. Exhaust groove; 8. Temperature sensor; 81. Placement rack. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0024] Example 1

[0025] like Figure 1 - Figure 4 As shown, a dry vacuum device for a twin-screw extruder includes a pump body 1 and a drive motor 2 mounted on the pump body 1. The pump body 1 has a pump chamber 11, an end cover 12 is mounted on the pump body 1, a claw knife assembly 5 is mounted in the pump chamber 11, and an exhaust port 4 and an air inlet 3 are mounted on the pump body 1.

[0026] It also includes:

[0027] One-way cleaning component 6 is installed inside the exhaust port 4. When exhausting, the one-way cleaning component 6 cleans the inner wall of the exhaust port 4.

[0028] Exhaust groove 7 is located on the inner wall of exhaust port 4, and exhaust is carried out through exhaust groove 7.

[0029] The one-way cleaning component 6 includes a mounting bracket 64, which is disposed inside the exhaust port 4. A slide rod 65 is slidably mounted on the mounting bracket 64, and a piston plate 61 is disposed at the lower end of the slide rod 65. The edge of the piston plate 61 is in close contact with the inner wall of the exhaust port 4, and the piston plate 61 is disposed above the exhaust groove 7. A spring 63 is disposed between the piston plate 61 and the mounting bracket 64. A limiting ring 62 is disposed inside the exhaust port 4, and the limiting ring 62 is disposed above the piston plate 61. During the exhaust process, the piston plate 61 moves under the push of the gas, and its edge is in close contact with the inner wall of the exhaust port 4. When it moves downward, it cleans the inner wall of the exhaust port 4, effectively solving the problem that the inner wall of the exhaust port 4 is prone to adsorbing oligomers, which affects the exhaust efficiency. At the same time, the one-way cleaning component 6 can ensure that the gas will not flow back after the vacuum pump stops, maintain the unidirectionality of the gas flow inside the device, ensure the stability and reliability of the device operation, and avoid the backflow of gas from damaging the equipment or interfering with the production process.

[0030] There are multiple exhaust grooves 7, which are evenly distributed on the inner wall of the exhaust port 4, increasing the exhaust area and allowing the gas to be discharged more smoothly, improving the exhaust efficiency and ensuring the efficient operation of the entire vacuum device.

[0031] The claw blade assembly 5 includes multiple first claw blades 51 and multiple second claw blades 52. The multiple first claw blades 51 and multiple second claw blades 52 are coaxially arranged in the pump chamber 11. A drive gear 511 is provided on the mounting shaft of the first claw blade 51, and a driven gear 521 is provided on the mounting shaft of the second claw blade 52. The drive gear 511 and the driven gear 521 mesh with each other. The mounting shaft of the first claw blade 51 is connected to the output end of the drive motor 2. The drive motor 2 provides power to the entire vacuum device. By connecting to the mounting shaft of the first claw blade 51, it drives the first claw blade 51 to rotate, and then drives the second claw blade 52 to rotate synchronously through gear transmission, realizing the efficient gas suction function. Its power output is stable and reliable, ensuring the continuous operation of the device.

[0032] It should be noted that when the dry vacuum device of the twin-screw extruder is working, the drive motor 2 starts, driving the first claw blade 51 mounting shaft connected to the output end to rotate. The drive gear 511 on the first claw blade 51 mounting shaft rotates accordingly, and through meshing with the driven gear 521, drives the second claw blade 52 mounting shaft to rotate. This causes the first claw blade 51 and the second claw blade 52 to operate synchronously in the pump chamber 11, drawing gas in from the air inlet 3. During the exhaust process, the gas is discharged from the exhaust port 4. At this time, the one-way cleaning component 6 in the exhaust port 4 plays a role, and the gas pushes the piston plate 61 against the elastic force of the spring 63. As the piston plate 61 moves upward, it slides along the mounting bracket 64 under the guidance of the slide rod 65. Since the edge of the piston plate 61 is in close contact with the inner wall of the exhaust port 4 and is located above the exhaust groove 7, the inner wall of the exhaust port 4 is cleaned when the piston plate 61 moves downward. When the piston plate 61 descends to the exhaust groove 7, exhaust is carried out through multiple exhaust grooves 7 evenly distributed on the inner wall of the exhaust port 4. In this way, the one-way cleaning component 6 ensures that the gas will not flow back after the vacuum pump stops. The inner wall of the exhaust port 4 is cleaned while the piston plate 61 moves, so as to avoid the long-term adsorption of oligomers on the inner wall of the exhaust port 4, which would affect the exhaust efficiency of the exhaust port 4.

[0033] Example 2

[0034] Further improvements were made based on Example 1, such as... Figure 5 As shown:

[0035] A placement rack 81 is provided at the lower end of the exhaust port 4, and a temperature sensor 8 is provided on the placement rack 81.

[0036] It should be noted that the temperature sensor 8 is securely mounted on the mounting bracket 81 at the lower end of the exhaust port 4. During actual operation, this temperature sensor 8 can continuously monitor the temperature near the exhaust port 4 in real time. Once the temperature fluctuates abnormally and exceeds the preset normal range, the control system will immediately issue an alarm to prevent equipment overheating from causing malfunctions and safety accidents.

[0037] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A dry vacuum device for a twin-screw extruder, comprising a pump body (1) and a drive motor (2) mounted on the pump body (1), wherein a pump chamber (11) is provided inside the pump body (1), an end cap (12) is provided on the pump body (1), and a claw knife assembly (5) is provided inside the pump chamber (11), characterized in that: The pump body (1) is provided with an exhaust port (4) and an air inlet (3); It also includes: One-way cleaning component (6) is provided inside the exhaust port (4). When exhausting, the one-way cleaning component (6) cleans the inner wall of the exhaust port (4). The exhaust groove (7) is set on the inner wall of the exhaust port (4) and exhaust is carried out through the exhaust groove (7).

2. The dry vacuum device for a twin-screw extruder according to claim 1, characterized in that: The one-way cleaning component (6) includes a mounting bracket (64) which is disposed inside the exhaust port (4). A slide rod (65) is slidably disposed on the mounting bracket (64). A piston plate (61) is disposed at the lower end of the slide rod (65). A spring (63) is disposed between the piston plate (61) and the mounting bracket (64). A limiting ring (62) is disposed inside the exhaust port (4) and is disposed above the piston plate (61).

3. The dry vacuum device for a twin-screw extruder according to claim 2, characterized in that: The piston plate (61) has its edge in close contact with the inner wall of the exhaust port (4), and the piston plate (61) is positioned above the exhaust groove (7).

4. The dry vacuum device for a twin-screw extruder according to claim 1, characterized in that: There are multiple exhaust grooves (7), which are evenly distributed on the inner wall of the exhaust port (4).

5. A dry vacuum device for a twin-screw extruder according to claim 1, characterized in that: The claw knife assembly (5) includes multiple first claw knives (51) and multiple second claw knives (52). The multiple first claw knives (51) are coaxially arranged in the pump chamber (11), and the multiple second claw knives (52) are coaxially arranged in the pump chamber (11). A drive gear (511) is provided on the mounting shaft of the first claw knife (51), and a driven gear (521) is provided on the mounting shaft of the second claw knife (52). The drive gear (511) and the driven gear (521) mesh with each other. The mounting shaft of the first claw knife (51) is connected to the output end of the drive motor (2).

6. The dry vacuum device for a twin-screw extruder according to claim 1, characterized in that: A placement rack (81) is provided at the lower end of the exhaust port (4), and a temperature sensor (8) is provided on the placement rack (81).

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